NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 563
ONVOY, LLC - IA 8
IMON COMMUNICATIONS, LLC - IA 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 3
NEW CINGULAR WIRELESS PCS, LLC - IL 1
LEVEL 3 COMMUNICATIONS, LLC - IA 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2015-09-23 563-514-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DAVENPORT IA
2015-09-15 563-506-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2015-09-04 563-594-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
2015-09-02 563-514-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2015-08-11 563-888-5XXX 5000–5999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DAVENPORT IA
2015-08-10 563-559-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON IA
2015-08-10 563-559-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON IA
2015-08-10 563-888-8XXX 8000–8999Assigned ONVOY, LLC - IA 221F DAVENPORT IA
2015-08-05 563-513-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DUBUQUE IA
2015-08-03 563-723-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
2015-07-08 563-202-9XXX 9000–9999Assigned AUREON COMMUNICATIONS, LLC 444G DECORAH IA
2015-06-30 563-513-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBUQUE IA
2015-06-29 563-228-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BELLEVUE IA
2015-06-29 563-315-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 STRAWBRYPT IA
2015-06-29 563-363-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MANCHESTER IA
2015-06-29 563-635-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 LE CLAIRE IA
2015-06-29 563-655-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 DE WITT IA
2015-06-23 563-202-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DECORAH IA
2015-06-23 563-231-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DUBUQUE IA
2015-06-05 563-506-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSCATINE IA
2015-06-05 563-613-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOW MOOR IA
2015-06-01 563-514-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2015-06-01 563-514-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2015-05-19 563-639-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2015-05-19 563-742-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2015-05-18 563-223-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELDRIDGE IA
2015-05-18 563-559-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON IA
2015-04-27 563-217-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E WAUKON IA
2015-04-27 563-447-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E WALCOTT IA
2015-04-22 563-503-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CLINTON IA
2015-04-22 563-503-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CLINTON IA
2015-04-21 563-293-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DAVENPORT IA
2015-04-21 563-293-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DAVENPORT IA
2015-04-21 563-293-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DAVENPORT IA
2015-04-13 563-594-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DAVENPORT IA
2015-04-08 563-258-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DUBUQUE IA
2015-02-27 563-513-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBUQUE IA
2015-02-18 563-554-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2015-02-12 563-657-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WALCOTT IA
2015-01-30 563-513-2XXX 2000–2999Assigned ONVOY, LLC - IA 221F DUBUQUE IA
2015-01-26 563-723-4XXX 4000–4999Assigned ONVOY, LLC - IA 221F DAVENPORT IA
2015-01-20 563-538-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E LANSING IA
2014-12-31 563-513-0XXX 0000–0999Assigned ONVOY, LLC - IA 221F DUBUQUE IA
2014-12-17 563-549-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2014-12-17 563-549-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2014-12-12 563-316-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 MUSCATINE IA
2014-12-12 563-949-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
2014-12-09 563-949-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DAVENPORT IA
2014-12-05 563-231-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
2014-12-04 563-329-1XXX 1000–1999Assigned UNITED STATES CELLULAR - IA 6266 MCGREGOR IA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.